Print Email Facebook Twitter Josephson radiation from gapless andreev bound states in HgTe-based topological junctions Title Josephson radiation from gapless andreev bound states in HgTe-based topological junctions Author Deacon, R. S. (RIKEN Center for Emergent Matter Science (CEMS)) Wiedenmann, J (University of Würzburg) Bocquillon, E (University of Würzburg) Domínguez, F. (University of Würzburg) Klapwijk, T.M. (TU Delft QN/Klapwijk Lab; Kavli institute of nanoscience Delft) Leubner, P. (University of Würzburg) Brüne, C (University of Würzburg) Hankiewicz, E. M. (University of Würzburg) Tarucha, S (RIKEN Center for Emergent Matter Science (CEMS); University of Tokyo) Ishibashi, K (RIKEN Center for Emergent Matter Science (CEMS)) Buhmann, H (University of Würzburg) Molenkamp, Laurens W. (University of Würzburg) Date 2017-04-20 Abstract Frequency analysis of the rf emission of oscillating Josephson supercurrent is a powerful passive way of probing properties of topological Josephson junctions. In particular, measurements of the Josephson emission enable the detection of topological gapless Andreev bound states that give rise to emission at half the Josephson frequency fj rather than conventional emission at fj. Here, we report direct measurement of rf emission spectra on Josephson junctions made of HgTe-based gate-tunable topological weak links. The emission spectra exhibit a clear signal at half the Josephson frequency fj=2. The linewidths of emission lines indicate a coherence time of 0.3-4 ns for the fj=2 line, much shorter than for the fj line (3-4 ns). These observations strongly point towards the presence of topological gapless Andreev bound states and pave the way for a future HgTe-based platform for topological quantum computation. Subject Condensed matter physics To reference this document use: http://resolver.tudelft.nl/uuid:6e2c1f3e-bf35-4edf-acf9-ad6bca86b32a DOI https://doi.org/10.1103/PhysRevX.7.021011 ISSN 2160-3308 Source Physical Review B, 7 (2) Part of collection Institutional Repository Document type review Rights © 2017 R. S. Deacon, J Wiedenmann, E Bocquillon, F. Domínguez, T.M. Klapwijk, P. Leubner, C Brüne, E. M. Hankiewicz, S Tarucha, K Ishibashi, H Buhmann, Laurens W. Molenkamp Files PDF PhysRevX.7.021011.pdf 1.14 MB Close viewer /islandora/object/uuid:6e2c1f3e-bf35-4edf-acf9-ad6bca86b32a/datastream/OBJ/view